As some of you know, my next favourite chip to AVRs and PICAXEs is the MAX7219.
I needed 3 more last week so rather than pay close on GBP33 for 3 from Farnell, who can resist a bargain 5 for GBP5.49 and free delivery from the Far East via the great auction site?
Did they arrive. Yes
Do they work. Err, sort of. Replacing a Farnell procured '7219 in a working circuit, not the first time (they go into Display Test mode (light all segments and dps on all digits) and seemingly ignoring the config commands sent to them soon after startup), but if you power cycle again they do. Switch off for a minute or so and you have to switch on, power cycle again and then they're OK. Strange.
Do the package dimensions match the Maxim datasheet - nope. The end legs are only half legs and are flush with the end of the ceramic package. The Farnell one has full legs at the end and the ceramic package extends beyond them (just like the datasheet says)
Is there printing and an embossed country of manufacture on the bottom of the chip like the Farnell ones. Nope.
Interesting...
I needed 3 more last week so rather than pay close on GBP33 for 3 from Farnell, who can resist a bargain 5 for GBP5.49 and free delivery from the Far East via the great auction site?
Did they arrive. Yes
Do they work. Err, sort of. Replacing a Farnell procured '7219 in a working circuit, not the first time (they go into Display Test mode (light all segments and dps on all digits) and seemingly ignoring the config commands sent to them soon after startup), but if you power cycle again they do. Switch off for a minute or so and you have to switch on, power cycle again and then they're OK. Strange.
Do the package dimensions match the Maxim datasheet - nope. The end legs are only half legs and are flush with the end of the ceramic package. The Farnell one has full legs at the end and the ceramic package extends beyond them (just like the datasheet says)
Is there printing and an embossed country of manufacture on the bottom of the chip like the Farnell ones. Nope.
Interesting...